I just installed a Pioneer AVH-P2400BT in my car (2006, base, no JBL) and it comes with a DVD player which will not play unless the parking brake is applied. Not that I'll be watching DVDs in the car while driving to work, but I read somewhere that a bypass is possible to hook up.

What I have learned so far is that I need a 5 pin relay and some wire and attach it to the green parking brake wire and something else. Problem is no one mentioned what kind of wire to be used which is what I would like to know. I have extra wires in the harness which are not being used (mute, power antenna, etc) but I would rather not cut them (for no good reason).

Try just attaching the green parking brake wire from your Pioneer wiring harness to the black ground wire. That's what I did with my Kenwood system and it worked fine.

This is incorrect for a pioneer units.
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And on to the correct way to do it with the AVH-"x"400 Series
It has changed on the newer ones AVH-"X"500

Although it is illegal to view while driving.
Pin 85 and 87 go to ground "black wiring in pioneer harness
pin 30 goes to the light green wire in the pioneer harness
pin 86 goes to the blue with white stripe wire in the pioneer harness

I heard that by doing that, at least with the Pioneer systems, that will not work. I have not confirmed it but I may try that first. thanks.

The guys at Crutchfield told me this wouldn't work either for my Kenwood DNX6990HD unit. They gave me directions to run the wire to the RAV4 fuse box located above the handle for opening the hood and then connect it to the parking brake wire located in this fusebox. I looked at doing this, but then saw how tight the area was and decided to just try grounding it instead to see if it worked. I haven't fully completed my installation yet, but at least with the RAV4 sitting in the driveway everything seems to work including playing the DVDs.

And on to the correct way to do it with the AVH-"x"400 Series
It has changed on the newer ones AVH-"X"500

Although it is illegal to view while driving.
Pin 85 and 87 go to ground "black wiring in pioneer harness
pin 30 goes to the light green wire in the pioneer harness
pin 86 goes to the blue with white stripe wire in the pioneer harness

The guys at Crutchfield told me this wouldn't work either for my Kenwood DNX6990HD unit. They gave me directions to run the wire to the RAV4 fuse box located above the handle for opening the hood and then connect it to the parking brake wire located in this fusebox. I looked at doing this, but then saw how tight the area was and decided to just try grounding it instead to see if it worked. I haven't fully completed my installation yet, but at least with the RAV4 sitting in the driveway everything seems to work including playing the DVDs.

It's because the gyro inside will sense your movement. That's how it tells your speed. There is other bypass for that has well

And any wire will work thin speaker wire.
18 awg primary wire, your not passing much current through the relay so no worries.

So with your experience do you think I will have problems with the way I connected my Kenwood? I'm still waiting for an iPod cable so I haven't completed the installation and haven't driven the RAV4 with the unit installed and powered on to see how things work. At least sitting in the driveway everything seems to work including playing DVDs and the GPS.